CommonTypeUnions 1.0.0

Common Union Types

[!WARNING] Type Unions are in the early proposal stage and will likely see changes as time goes on, we plan to keep up with these changes as much as possible to ensure the easiest migration path once type unions make it into a stable .net version.

This library contains a set of commonly used type unions.

Type unions are an upcoming feature that is proposed for a future version of C#. We try our best to keep the types in this library as close as possible to the proposal as possible to make a transition to future Type Unions as easy as possible.

Option<TValue>

Option is a struct union found in many languages, it can either represent a value that is something (Some) or nothing (None).

using CommonTypeUnions.Unions;
using static CommonTypeUnions.Extensions.OptionExtensions;

Option<string> x = Some("text");
Option<string> y = None();

if (x.IsSome(out var value))
{
    Console.WriteLine($"Value: {value}");
}

var isNone = y.IsNone();

Console.WriteLine($"Is None: {isNone}");

Output:

Value: text
Is None: True

Result<TValue, TError>

Option is a struct union found in many languages, it is used to either represent a successful result (Success) or error (Failure) from a function.

using CommonTypeUnions.Unions;
using static CommonTypeUnions.Extensions.ResultExtensions;

Result<int, string> x = Success(42);
Result<int, string> y = Failure("Oh no");

if (x.IsSuccess(out var value))
{
    Console.WriteLine($"Value: {value}");
}

if (y.IsFailure(out var error))
{
    Console.WriteLine($"Failure: {error}");
}

Output:

Value: 42
Failure: Oh no